Study on Power Flow Improvement Using Static Compensators and Thyristor Controlled Series Capacitor in Transmission Network

In power systems, the growing load demand causes highly stressed operating conditions in the transmission lines, which leads to voltage instability, power flow and power losses problems. So that, Flexible AC Transmission Systems (FACTS) devices with a suitable control strategy have the potential to solve these issues. Presented in this paper is the effect of Thyristor Controlled Series Capacitor (TCSC) and Static Compensators (SC) in power flow improvement and voltage stability. A study of the load flow before and after inserting the series compensation devices using Newton Raphson’s method by NEPLAN software was conducted on two different reference networks (IEEE-9 Buses, IEEE-11 Buses). Consequently, the simulation results showed the application of SC and TCSC enhanced the power flow by delimiting the accurate values of series compensators and the optimal location of these devices in the studied networks. Notably, the simulation study showed TCSC superiority over SC in improving the transmitted power, due to its control ability and the structure of thyristor controlled reactor in the TCSC. Moreover, TCSCs have a quick response to the demand changes in electrical networks.